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The lens equation $\frac { 1 } { f }$ = $\frac { 1 } { f1 }$ + $\frac { 1 } { f2 }$ is applicable

when the thickness of the lens is small

only to conjugate distances along the principal axis

the computed quantities are accurate enough for geometrical optics of simple distances

all the above.

Answer : Option D

Explanation :

No answer description available for this question.

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